A certain bacteria is growing at 32.8% per day. a. Find the time it will take for a sample of the bacteria to triple in size
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1. A certain bacteria is growing at 32.8% per day.
a. Find the time it will take for a sample of the bacteria to triple in size
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- work on this problem. For a sample of 9 automobiles, the mileage (in 1000s of 5) Show miles) at which the original front brake pads were worn to 10% of their original thickness was measured, as was the mileage at which the original rear brake pads were worn to 10% of their original thickness. The results were as follows: ´your Car Rear Front 1 41.2 32.5 35.8 26.5 3 46.6 35.6 4 46.9 36.2 5 39.2 29.8 51.5 40.9 51.0 46.0 7 40.7 34.5 9. 47.3 36.5 a. Construct a 99% confidence interval for the difference in mean lifetime between the front and rear brake pads. b. An automotive engineer claims that the mean lifetime for rear brake pads is more than 10,000 miles more than the mean lifetime for front brake pads. Does the confidence interval contradict this claim?Listed below are amounts of strontium-90 (in millibecquerels, or mBq) in a simple random sample of baby teeth obtained from residents in a region born after 1979. Use the given data to construct a boxplot and identify the 5-number summary. a. The 5-number summary is all in mBq. (Use ascending order. Type integers or decimals. Do not round.) b. Which boxplot below represents the data?The control department of a light bulb manufacturer randomly picks 4400 light bulbs from the production lot every week. The records show that, when there is no malfunction, the defect rate in the manufacturing process (due to imperfections in the material used) is 1%. When 1.25%o or more of the light bulbs in the sample of 4400 are defective, the control unit calls repair technicians for service. Answer the following. (If necessary, consult a list of formulas.) (a) Find the mean of p, where p is the proportion of defective light bulbs in a sample of 4400 when there is no malfunction. (b) Find the standard deviation of p. (c) Compute an approximation for P(p N 0.0125), which is the probability that the service technicians will be called even though the system is functioning properly. Round your answer to four decimal places.
- 2019 AP® STATISTICS FREE-RESPONSE QUESTIONS 2. Researchers are investigating the effectivencss of using a fungus to control the spread of an insect that destroys trees. The researchers will create four different concentrations of fungus mixtures: 0 milliliters per liter (ml/L), 1.25 ml/L, 2.5 ml/L, and 3.75 ml/L. An equal number of the insects will be placed into 20 individual containers. The group of insects in each container will be sprayed with one of the four mixtures, and the researchers will record the number of insects that are still alive in each container one week after spraying. (a) Identify the treatments, experimental units, and response variable of the experiment. Treatments: Experimental units: Response variable: (b) Does the experiment have a control group? Explain your answer. (c) Describe how the treatments can be randomly assigned to the experimental units so that each treatment has the same number of units.... 11:32 PM Tue Jan 19 * 48% AA A etext-ise.pearson.com PB Introduction - Orego... E еТеxt P Course Home - Diam... Pearson eText PRACTICE Find three numbers such that the second number is 8 less than triple the first number, the third number is five times the first number, and the sum of the three numbers is 118.The number of years N(r) since two independently evolving languages split off from a common ancestral language is approximated by N(r) = – 4000 lIn r where r is the proportion of the words from the ancestral language that are common to both languages now. a. N(0.9) = (Round to the nearest tens place.) %3D b. N(0.4) = (Round to the nearest hundreds place.) c. N(0.1) = (Round to the nearest thousands place.) d. How many years have elapsed since the split if 60% of the words of the ancestral language are common to both languages today? years have elapsed since the split. (Round to the nearest hundreds place.) e. If two languages split off from a common ancestral language about 2000 years ago, find r. r = (Round to the nearest tenth as needed.)
- #1. A baseball team won 9 out of 23 games. What is their winning percentage? #2. Ms. Smith went on a diet and lost 10 pounds which was 6% of her body weight before she started her diet. What was her weight before and after dieting?Find P15, Q1,D3,Q2,D6 and P85Life-saving drug: Penicillin is produced by the Penicillin fungus, which is grown in a broth whose sugar content must be carefully controlled. Several samples of broth were taken on three successive days, and the amount of dissolved sugars, in milligrams per milliliter, was measured on each sample. The results were as follows. Day 1: 4.8 5.2 5.3 5.0 5.0 4.8 4.7 4.9 5.0 4.6 4.7 5.1 4.8 Day 2: 5.1 4.7 4.7 5.0 5.2 5.0 5.5 5.0 4.9 5.1 5.3 5.0 5.6 Day 3: 5.6 5.0 5.0 5.7 5.3 5.2 5.0 5.4 5.2 5.1 5.3 5.1 5.1 Send data to Excel Part: 0 / 2 Part 1 of 2 (a) Construct an ANOVA table. Round your answers to four decimal places as needed. One-way ANOVA: Sugar Concentration Source DF MS F P Days Error Total
- 5) Cobalt-60 is used in many common industrial applications and in radiotherapy in hospitals. Large sources of cobalt-60 are increasingly used for sterilization of spices and certain foods. The powerful gamma rays kill bacteria and other pathogens, without damaging the product. After the radiation ceases, the product is not left radioactive. This process is sometimes called "cold pasteurization. The following is the experimental data taken for Cobalt-60 Time (year) 2 70 Mass (g) And the model for radioactive decay is: •(†Ð)* m = m₂ Σ... - [(Σ.) (Σ.)]/n Σx² - (Σxi)²/n 6 45 b₁ = bo = ý – b c) Find mo and the half-life of this material 11 22 a) Linearize the proposed equation b) Find the equation of the regression line by least squares estimates 14 12 17 10 21 4The specific laboratory are being used to perform chemical analysis. Samples of the same material are sent to the laboratories for analysis as part of the study to determine whether or not they give, on the average, the same result. The analytical results are as follows:- Lab results 58.7-61.9 62.0-65.2 65.3-68.5 68.6-71.8 71.9-75.1 f 4 5 13 9 4 What is the Modal values of the laboratory?